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Method for fixing prosthesis to bones
| Details |
Inventors: Vrespa, Giuseppe;
Assignee:
Primary Examiner: Isabella; David
Assistant Examiner: Burke; Elizabeth M.
Attorney, Agent or Firm: Ladas & Parry
In a screw device (10; 80) for fixing prostheses to bones, the threaded shank (14) comprises a core (32, 34) of overall frusto-conical shape. The screw has a cylindrical neck (12) of diameter equal to or greater than the maximum diameter of the thread. This latter is of two different types, namely a first thread (26) of large pitch for fixing into the trabecular bone tissue (52) and a second thread (28), which can be of the self-tapping type, for fixing into the cortical bone opposite the point at which the screw is inserted into the bone. The second thread (28) has a number of starts which is a multiple of that of the first thread (26). For orthopedic use the screw (80) can comprise a third thread (128) on a part of the neck (112) for fixing into the relative cortical bone (50). A method for applying the screw device (10; 80) consists of forming a precision hole (40) in the bone, tapping said hole with a tapper (60; 100), and screwing the screw (10; 80) into it. The precision hole (40) is obtained by using a cutter (100) in the shape of an inverted "wedding cake", then reaming the obtained cavity with a manual reamer (140). |
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DETAILED DESCRIPTION I claim: 1.
A method for applying a screw device for fixing a prosthesis to bones, the screw device having a neck and a threaded shank, the shank having a core, a first thread portion of large pitch and a second thread portion, the method comprising: forming a precision hole in the bone where the screw device is to be inserted, the hole comprising: a first outer cylindrical portion for receiving the neck, the first portion having a diameter equal to or slightly less than the neck; a second inner frustoconical portion having a diameter equal to or slightly less than the core having the first thread portion; and a third portion having a diameter slightly greater than the core of the shank where the second thread portion is located; tapping the second portion of the hole to form a female thread therein for receiving the first thread portion of the screw; and completely screwing the screw device into the hole.
2.
A method as claimed in claim 1 wherein the neck comprises a core and a thread thereabout, and the first portion of the hole has a diameter slightly greater than the core of the neck.
3.
A method as claimed in claim 1 further comprising the step of tapping the third portion of the hole to obtain therein a female thread suitable for receiving the second thread portion.
4.
A method as claimed in claim 1 wherein the second thread portion is self tapping.
5.
A method as claimed in claim 1 wherein the hole is formed with a bone tissue cutter of the type cooled by sterile liquid, bone shavings are removed, and a telescoping shaped cutting part is provided.
6.
A method as claimed in claim 1, further comprising the step of obtaining the hole with a reamer, the reamer having a relief angle suitable for cutting bone tissue, the method further comprising conveying isotonic liquids into a cavity formed in the bone.
7.
A method as claimed in claim 6 wherein isotonic liquids are conveyed through a coaxial channel, the channel communicating with an isotonic feed device.
8.
A method as claimed in claim 1 comprising first forming a stepped cavity having dimensions less than or equal to a required precision hole, and manually reaming the stepped cavity to obtain a hole of required precision
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